Opinions? Haha

I've known this guy.. We'll call him J. 

I've known J for 6 years. 

I lost my virginity to J. 

We have been through a lot of bad times. But we've had a lot of good times too. 

The only time we ever see each other is 1. To have sex. Or 2. At a funeral of a mutual friend. 

We are, weirdly, friends on social media stuff. 

Well, we've discussed the whole him being in a relationship thing a little bit & I pointed out that I think he should be in an open relationship because one person doesn't really satisfy him physically. & he agreed. Which is totally fine.. Some people are like that. Whatever. Haha I don't really care that he sleeps with others girls sometimes as long as they are not my friends which brings me to my question. 

How do you know if your fuck buddy has feelings for you? Because I definitely do. 

I feel like he does but it's hard to know for sure? 

He has asked me not to sleep with his friends which tells me he gets jealous.  He is cute with me when we're around each other. Sometimes we'll cuddle & watch a movie after we have sex. 

I feel like the only reason he doesn't want to be anything more with me is because I have a 3 year old child. 

Which, I don't want to be together anyway. I just wanna know if he likes me. I mean it's been 6 years.. Lol that seems like a long time to keep coming back to the same person for sex.